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def topology (objects, stitchPoles=True,quantization=1e4,id_key='id',property_transform=property_transform,system = False,simplify=False):
ln = Line(quantization)
id_func = lambda x:x.get(id_key, None)
if simplify:
objects = simplify_object(objects,simplify)
[x0,x1,y0,y1]=bound(objects)
oversize = x0 < -180 - E or x1 > 180 + E or y0 < -90 - E or y1 > 90 + E
if not system:
if oversize:
system =systems["cartesian"]
else:
system = systems["spherical"]
if system.name == 'spherical':
if oversize:
raise Exception(u"spherical coordinates outside of [±180°, ±90°]")
if stitchPoles:
stitch(objects)
[x0,x1,y0,y1] = bound(objects)
if x0 < -180 + E:
x0 = -180
if x1 > 180 - E:
x1 = 180
if y0 < -90 + E: